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the application. Moreover, a great thing about implementing business logic inside the database tier is that it lets you centralize control over that logic and improve reusability. As usual, however, all good things come at a price. Now that you have simplified the Order entity because of removing the code defining a relationship with the Book entity, and now that you don t have the Book entity at all, how are you going to access the books table, if needed For example, you might want your application to display information about the number of available book copies when a user opens the book s page (long before she might want to purchase a copy, placing an order). To obtain this information, you need to access the books table somehow. This problem has more than one solution. One possible solution to the problem is to restore the Book entity, while not restoring the original Order entity (since you don t need to establish a relationship between these two entities again). In this particular example, this would be the optimal solution, since all you need here is the value of the quantity field of a certain record in the books table. This value could be easily obtained with the help of the getQuantity getter method of the Book entity. With JPA, you could obtain the required instance of the Book entity through either the entity manager, JPQL, or a native SQL query. All these approaches will be discussed in later chapters of this book. Another solution to the problem is to directly issue a native SQL query against the books table from within the business logic tier using the Java Database Connectivity (JDBC) technology. Schematically, this might look like Figure 5-8.

A key feature of CouchDB is that it is a document-oriented database management system Basically, this means that the data stored in a CouchDB database comprises a series of documents, each of which can contain a series of fields and values Each document is independent of one another, and there is no strict schema that they must adhere to Traditional databases that adhered to the relational model stored data in a series of tables; they were made up of rows and columns of data In a relational database, you must predefine the schema that all data in each table will adhere to, and all the data contained in the table must strictly conform to that schema If you are used to SQL-based databases like Oracle, SQL Server, and MySQL, you are probably quite familiar with the concepts of relationships, primary keys, foreign keys, referential integrity, and so forth.

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In all the previous examples, the assumption was made that the object you were looking for existed when you asked for it. The browser makes each element on the page available via JavaScript as it reads and renders each one. However, because JavaScript code is normally included in the head of the document, the body of the document is unavailable to you. Trying to access an object before it is available will generate an error. Therefore, before you can interact with any of the elements on the page, you have to wait until the page is loaded. As you just saw, you can wait until the page loads by using the window.onload event: var el = document.getElementById("myelement"); // will generate an error message window.onload = function() { var el = document.getElementById("myelement"); // yay! I've got my element! } Oh, but there s a catch. (There had to be one.) The catch is that the onload event doesn t fire until the entire page and all its images have been downloaded. The user could be interacting with the page well before the onload event actually is run. To get around this, you have some options, but unfortunately, there s no silver bullet solution. The easiest traditional way was simply to place some JavaScript to run at the very end of the HTML page. Any HTML elements before the code should be accessible via the script. It isn t very unobtrusive, however.

Figure 5-8. You can access database objects directly from within the business logic tier with the help of the native SQL queries. As you can see in the figure, native SQL queries can be issued from within enterprise beans against database tables, views, or stored procedures. In this particular example, you might create a separate enterprise bean and define a business method within it, which will query the books table with a SELECT query issued through the Persistence Provider. JDBC should be used only in cases where the application developer knows that the Persistence Provider will not be accessed within the same transaction or the transaction is managed by the container and a managed datasource is used.

Figure 5-9 identifies the application components involved in the operation of getting the number of copies of a book and depicts the interaction between them.

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